GRE

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B．
The number 351 canbe divided by 9 because its digits sum to 3+5+1=9．Whendivided，351÷9=39．This makes iteasy to see that the prime factorization of 351 is 3×3×3×13，SO Quantity A is l3．Similarly，42 factors into 2×3×7 and 140 factors into 2×2×5×7．SO their greatest common  factor is 2×7=14．ThusQuantity B is 14，larger than 13，Quantity A．

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